Blitzø (the "o" is silent) is the chaotic founder of the assassination company I.M.P. Behind his abrasive persona lies a deep fear of vulnerability, driving his complex relationships. ​His dynamic with Stolas began as a transactional arrangement for access to the human realm, evolving into a messy, emotional bond as both struggle with their genuine feelings. ​At work, he relentlessly teases and invades the privacy of his level-headed employee Moxxie, yet deeply values his skills. He shares a far smoother, supportive friendship with Millie, Moxxie's fierce wife. ​Meanwhile, Blitzø treats his adopted hellhound receptionist, Loona, with fierce parental affection, constantly seeking her approval despite her distant behavior.

Moxxie is the anxious, precise weapons expert and co-founder of I.M.P. Despite his neurotic nature and desire for professionalism, he remains fiercely loyal to the company. ​His marriage to Millie is his anchor—a passionately loving, mutually supportive partnership where her fierce strength complements his calculated precision. ​With Blitzø, Moxxie shares a constantly tense dynamic; he is the frequent target of his boss's boundary-crossing antics and insults, yet they rely heavily on each other when missions get chaotic.

Millie is the cheerful, brutally efficient powerhouse of I.M.P. Beneath her warm, upbeat demeanor lies a terrifying lethal talent that makes her the team’s ultimate enforcer. ​Her marriage to Moxxie is the heart of her life—she is fiercely protective of him, adoring his sweet nature while balancing his anxieties with her unshakeable confidence. ​She holds a smooth, playful friendship with Blitzø, enthusiastically supporting his wild schemes while keeping his chaos from completely derailing their work.

Loona is the cynical, sarcastic hellhound receptionist for I.M.P. Beneath her aggressive, distant exterior lies a deeply guarded young woman who struggles with opening up. ​Her relationship with Blitzø, her adoptive father, is wrapped in thick layers of teenage angst; while she frequently shuns his overbearing affection, she secretly cares for him as the person who took her in. ​She views Moxxie with open disdain, constantly mocking his anxieties and shutting down his attempts at authority. ​Conversely, her dynamic with Millie is far more laid-back, sharing a mutual respect and occasionally joining forces when it comes to keeping the men of I.M.P. in line.

Stolas is an aristocratic Goetia prince with a gentle, romantic nature that contrasts sharply with his lonely, formal royal upbringing. ​His relation to his teenage daughter, Octavia, is the absolute anchor of his heart; he adores her completely and constantly strives to provide her with love, stability, and comfort amidst his failing marriage and personal chaos. ​His complex bond with Blitzø evolved from a secretive, lustful bargain into a deep, painful emotional attachment as he yearns for genuine intimacy beyond their social divide. ​With Moxxie, Millie, and Loona, Stolas maintains a polite yet detached demeanor, viewing them primarily as Blitzø’s quirky entourage and employees while staying broadly friendly to his lover’s circle.

Octavia is the quiet, brooding Goetia princess who navigates the chaotic breakdown of her parents' marriage with a guarded, cynical front. ​Her relationship with her father, Stolas, is deep but strained; she loves him immensely and relies on him as her primary source of comfort, yet frequently feels neglected and overwhelmed by his personal drama and affair. ​She views Blitzø with intense bitterness and resentment, seeing him as the intruder who shattered her family’s stability. ​With Moxxie, Millie, and Loona, Octavia remains entirely distant, though she shares a brief, unspoken common ground with Loona over the shared frustration of having overbearing, chaotic fathers.

Fizzarolli is a energetic, famous cybernetic imp performer and former circus superstar. Beneath his loud, theatrical persona lies a deeply sensitive demon who has survived severe trauma and injury. ​His relationship with Blitzø is a painful, complex journey—once childhood best friends whose bond was shattered by a tragic circus fire, they harbored years of bitter resentment before finally reconciling and healing their friendship. ​With Stolas, Fizzarolli shares a mutual connection through royal circles and Asmodeus, treating him with cheeky, theatrical familiarity. ​While he has limited direct interaction with Moxxie, Millie, and Loona, he generally views I.M.P.'s chaotic antics with amused detachment or mild annoyance, far more focused on his own show business and life with Asmodeus.

Verosika Mayday is a pop star succubus and Blitzø's bitter ex-girlfriend. Beneath her glamorous, sharp-tongued celebrity persona is someone deeply hurt by past heartbreaks. ​Her relationship with Blitzø is defined by intense hostility and resentment after he abandoned her, leading her to harbor an ongoing feud with him and I.M.P. ​She views Stolas with a mix of pity and cynicism, recognizing another victim of Blitzø's emotional baggage and chaos. ​With Moxxie, Millie, and Loona, Verosika remains condescending and dismissive, viewing the whole I.M.P. crew as an embarrassing circus while occasionally clashing with them over shared space or business.